Electrode-holder for electric-arc lamps.



H. N. OTT. ELECTRODE HOLDER FOR ELECTRIC ARC LAMPS.

APPUCATION FILED SEPT-15. I915.

Patented July 30, 1918.

UNITEDUKSTATES HARVEY N. OTT, OF BUFFALO,

NEW YORK, ASSIGNOR TO SPENCER BUFFALO. NEW YORK.

LENS COMPANY, OF

ELECTRODE-HOLDER Eon ELECTRIC-ARC LAMPS.

Application filed September 15, 1915.

To all whom it ma concern:

citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Electrode-Holders for Electric-Arc Lamps, of which the following is a specification.

This invention relates to holders for the carbons or electrodes of electric arc lamps and the object of the invention is to provide a practical and desirable electrode holder of simple and inexpensive construction, which will securely hold the carbon or electrode and which can bereadily adapted for holding carbons or electrodes which differ considerably in size.

In the accompanying drawings:

Figure 1 is a side elevation of the electrode supporting and adjusting means of an' electric arc lamp provided with holders embodying the invention. i

Fig. 2 is a sectional elevation thereof, on an enlarged scale, in line 22, Fig. 1,'showing one of the electrode holders.

Figs. 3 and 4 are'similar views the holder adjusted for carbons of sizes.

Fig. 5 is a detached perspective view of one of the jaws or members of the holder.

Fig. 6 is a detached perspective view of the other jaw or member of the holder.

Fig. 7 is a bottom plan view of the lower end portion of the holder.

A and B represent the two carbons or electrodes of an electric arc lamp and C and D represent holders in which the carbons different or electrodes A and B are respectively secured and by which they are adapted to be I fed. or adjusted toward each other.

The holders are substantially alike in c011- struction and the following description, of the holder 0 applies also to the other holder D.

The holder comprises a relatively stationary jaw or member 1 and a movable jaw or member 2 which is fulcrumed on the stationary jaw and is adapted to be moved toward the same by a thumb screw 3 for clamping the carbon or electrode between the two jaws and rigidly securing it in the holder. The stationary jaw 1 is preferably provided with a transverse V-shaped notch or seat 4, in which the carbon rests and is Specification of Letters Patent. l

showing properly grip and hold a Serial No. 50,892.

held by the movable jaw 2, and is provided Be it known t at I, HARVEY N. On, a

at one side of the electrode seat 4 with a projecting fulcrum post or part 5 with which the movable jaw 2 has a detachable fulcrum engagement. Preferably, the fulcrum post.

5 is provided with fulcrum pins '6 and 7 which pro ect laterally to opposite sides Patented July so, 1918.

thereof, and the movable jaw 2 is slotted or bifurcated at one end, as indicated at 8 in Fig. 6, to straddle the post 5 beneath one or the other pair of pins 6 or 7. The movable jaw 2 is end or at the posite side of the electrode seat from the provided at its opposite portion thereof at the opfulcrum post with a hole 9 through which the thumb screw 3 loosely passes, the thumb screw entering and being adapted to turn in a screwt'hreaded hole in the stationary jaw or member 1. The head of the thumb screw engages the outer side of the movable jaw so that the movable jaw is forced toward the stationary thumb screw. Between its ends, opposite the seat in the stationary jaw, the opposite sides of the movable jaw are of different formatio'n, one side 10 being, for instance, sub: stantially flat or straight, while the opposite side has a raised portion 11 and the movable .jaw is adapted to be placed with either its straight face 10 or the raised portion 11 facing and adapted to bear on the carbonor indicated in Fig. 2, withits straight side 10. against the carbon or electrode and with its bifurcated end under the lower pair of fulcrum pins 6, it is adapted to grip and firmly hold a carbon or electrode A of a size such as lndlcated 1n Fig. 2. By removlng the Fig. 4. By placing the movable jaw with jaw by screwing up the electrode. If the. movable jawis placed as its bifurcated end beneaththe'upper pair of fulcrum pins 7 and with its raised portion 11 against the carbon, the holder will carbon of larger size than when the movable jaw is placed as shown in either Fig. 2 or Fig. 4;, and the holder can be adapted for a still larger sized carbon by reversing the movable jaw so that its straight side will bear upon the carbon while its bifurcated end engages the upper pair of fulcrum pins 7. Thus by placing the movable jaw in one or the other of its reversible positions and engaging it with one or the other pair of fulcrum pins, the holder is adapted for holding carbons of four different sizes. In all of its several difierent positions, the movable jaw occupies such an angular relation to the stationary jaw that the holder is equally efficient in the several different adjustments of the movable jaw and can be readily operated by turning the thumb screw to firmly grip and hold the carbon. To change the movable jaw from any one to another of its several different operative positions it is only necessary to unscrew the thumb screw and slip the movable jaw out of engagement with the fulcrum post, again place it in connection therewith in the desired position, and replace the thumb screw.

Manifestly the holder can be adapted for a greater or less number of different sizes of carbons by employing the requisite number of fulcrum pins on the post 5.

In the construction shown, the holders C and D are secured respectively to slides or carriages 12 and 13 which are adjustable lengthwise of the carbons or electrodes in the supporting frame or structure of the lamp. As shown, the stationary jaw of each holder is provided with a shank 1% which is secured by a clamping plate 15 and screws 16 to the slide or carriage, the holder being suitably insulated from the slide or carriage. The slide or carriage 12 is slidably mounted on a guide rod 17 secured to the supporting frame 18, and is provided with shoulders or portions 19 adapted to engage the edges of the frame 18 for holding the slide from turning on the guide rod. The other carriage 13 is similarly mounted and guided on the frame 18. The slide or carriage 12 is adjusted along its. guide rod by a hollow screw shaft 20 which is lournaled in the frame 18 and is provided with a screw thread engaging a threaded arm or lug 21 on the slide or carriage 12. This adjusting shaft is adapted to be turned by a thumb wheel or knob 22 at its end. The slide or carriage 13 for the other carbon is adjusted by a shaft 23 having a screwthread engaging a lug on the carriage or slide, and this shaft is connected by bevel gears 24, 25 to an operating shaft 26 which extends through the hollow shaft 20 and is provided at its outer end with a knob or wheel 27 for turn ing it.

The manner of mounting and adjusting the carbon holders above described is not a part of the invention and is not claimed herein. The holders could be adjust-ably mounted and adjusted in any other suitable manner.

I claim as my invention:

1. In an electrode holder adapted to hold electrodes of different sizes, the combination of a stationary jaw and a movable jaw between which the electrode is held, said stationary jaw having a post provided with fulcrum projections at different distances from the body of said jaw, said movable jaw having a slotted end adapted to straddle said post and to engage with one or another of said projections, and means for pressing said movable jaw against an electrode.

2. In an electrode holder adapted to hold electrodes of different sizes, the combination of a stationary jaw and a movable jawbetween which the electrode is held, said stationary jaw having a plurality of fulcrum projections arranged at different distances from the body of said jaw, said movable jaw having one end which is adapted to be inserted into engagement with one or another of said projections, and a screw extending through the other end of said movable jaw and adapted to move said movable jaw to clamp said electrode.

3. In an electrode holder adapted to hold electrodes of different sizes, the combina: tion of a stationary jaw and a movable jaw between which the electrode is held, said stationary jaw having a plurality of fulcrum projections arranged at different distances from the body of said'jaw, said movable jaw having one end which is adapted to be inserted into engagement with one or another of said projections, said movable jaw having sides of different formation and being adapted to be reversed to have either of said sides face said stationary jaw, and means for pressing said movable jaw against said elec- I trode.

Witness my hand, this 10th day of September, 1915.

HARVEY N. OTT.

lVitnesses LOUIS M. POTTER, CHARLEsW. BARTAN.

Copies of this patent may be obtained for five cents-each, by addressing the Commissioner of Patents,

Washington, D. 0. 

